The companies say that the proposed deal would entail Rio Tinto making an all-share acquisition of "all or part" of Glencore. No details have been provided on any takeover premium or on the combined group's governance. This is the second such attempt in just over a year: in 2024, Glencore had already approached Rio Tinto - unsuccessfully. Under standard terms, discussions remain preliminary and there is no guarantee that they will result in a deal.

More appreciated for Glencore than for Rio Tinto

News of the talks sent Glencore's Wall Street-listed shares up 6%, while Rio Tinto's stock fell by about the same (-6.3%) in Sydney, its steepest intraday drop since July 2022. Some analysts fear that the group, which would be the acquiring entity, could pay too much for Glencore. Under UK takeover rules, Rio Tinto has until February 5 to make a firm offer or walk away.

"This comes as no surprise and this scenario has long been supported by AlphaValue," the French broker said. "Moreover, with BHP on the back foot after several unsuccessful attempts to buy Anglo American, the timing seems ideal for Rio and Glencore to join forces and finally establish themselves as the new global number one in diversified mining," it added.